Population trend inferred from aural surveys for calling anurans in Korea
- 주제(키워드) Aural survey , Population trend , Encroachment , Hylid , Dryophytes suweonensis , Republic of Korea
- 주제(기타) Multidisciplinary Sciences
- 설명문(일반) [Borzee, Amael] Seoul Natl Univ, Sch Biol Sci, Lab Behav Ecol & Evolut, Seoul, South Korea; [Borzee, Amael; Andersen, Desiree; Jang, Yikweon] Ewha Womans Univ, Div EcoSci, Seoul, South Korea; [Jang, Yikweon] Ewha Womans Univ, Dept Life Sci, Seoul, South Korea
- 등재 SCIE, SCOPUS
- 발행기관 PEERJ INC
- 발행년도 2018
- URI http://www.dcollection.net/handler/ewha/000000156295
- 본문언어 영어
- Published As http://dx.doi.org/10.7717/peerj.5568
초록/요약
Amphibian populations fluctuate naturally in size and range and large datasets are required to establish trends in species dynamics. To determine population trends for the endangered Suweon Treefrog (Dryophytes suweonensis), we conducted aural surveys in 2015, 2016, and 2017 at each of 122 sites where the species was known to occur in the Republic of Korea. Despite being based on individual counts, the focus of this study was to establish population trends rather than population size estimates, and we found both environmental and landscape variables to be significant factors. Encroachment was also a key factor that influenced both the decreasing number of calling individuals and the negative population dynamics, represented here by the difference in the number of calling individuals between years. Generally, most sites displayed minimal differences in the number of calling males between years, although there was a large fluctuation in the number of individuals at some sites. Finally, when adjusted for the overall population size difference between years, we found the population size to be decreasing between 2015 and 2017, with a significant decrease in the number of calling individuals at specific sites. High rate of encroachment was the principal explanatory factor behind these marked negative peaks in population dynamics.
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